Is there a completed list of all 280 perks available?

not yet. we still don't know a lot of alteration and restoration and some others.

How many have been revealed, would you say?

most of them probably, but some of the magic schools are not complete. Maybe we have 80-90%

Has a full list out yet. I heard someone say there was more new ones. Also do you have to obtain one perk say before another perk?